Just wanted to show you people this link. It may be helpful sometimes with creating custom parts in a semi quick way.
It has a low melting point so it may not work to well with poly but maybe epoxy? Anyways just thought I’d share. I’ll be picking some up.
I used to play with sheets of hot-water moldable plastic. I thought it was called Smart Plastic, but I can’t find it on a quick google scan. Prob’ the same stuff. Might work with P/VERs…time for testing 
This looks like interesting stuff. I might have to give it a try.
Thanks for posting this!